Kawasaki did not produce production motocross machines for the 1977 model year, as their previous version had been proven obsolete by the introduction of long-travel suspension by Kawasaki's competitors, most notably the Suzuki RM250A. Kawasaki returned in 1978 with a limited production and totally revised KX240A-4. The 1980 KX models were the first to use a modern single-shock rear suspension. Water-cooling and front disk brake were instituted with the 1982 models.

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History

The KX250 introduced in 1974 was Kawasaki's first serious attempt at a production motorcross bike. This differed from their earlier efforts in that it wasn't an offshoot of a mainly enduro themed machine. It began a line of production motocrossers that are highly respected for their strength and competitiveness. Kawasaki has always followed a route of continuous development for their KX series lending them to always be competitive and for the speed at which factory racing developments make it into the production machines.